EP0323910B1 - Méthodes de recherche pour milieux d'enregistrement - Google Patents

Méthodes de recherche pour milieux d'enregistrement Download PDF

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Publication number
EP0323910B1
EP0323910B1 EP89300103A EP89300103A EP0323910B1 EP 0323910 B1 EP0323910 B1 EP 0323910B1 EP 89300103 A EP89300103 A EP 89300103A EP 89300103 A EP89300103 A EP 89300103A EP 0323910 B1 EP0323910 B1 EP 0323910B1
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EP
European Patent Office
Prior art keywords
recording medium
signal
recorded
target position
tape
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89300103A
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German (de)
English (en)
Other versions
EP0323910A3 (en
EP0323910A2 (fr
Inventor
Yoshizumi C/O Patents Division Inazawa
Brian C/O Hewlett-Packard Limited Milthorp
Bruce C/O Hewlett-Packard Limited Thompson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hewlett Packard Ltd
Sony Corp
Original Assignee
Hewlett Packard Ltd
Sony Corp
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Filing date
Publication date
Application filed by Hewlett Packard Ltd, Sony Corp filed Critical Hewlett Packard Ltd
Publication of EP0323910A2 publication Critical patent/EP0323910A2/fr
Publication of EP0323910A3 publication Critical patent/EP0323910A3/en
Application granted granted Critical
Publication of EP0323910B1 publication Critical patent/EP0323910B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/05—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container
    • G11B15/087—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container by sensing recorded signals
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
    • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
    • G11B27/3063—Subcodes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/026—Control of operating function, e.g. switching from recording to reproducing by using processor, e.g. microcomputer
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/102—Programmed access in sequence to addressed parts of tracks of operating record carriers
    • G11B27/107—Programmed access in sequence to addressed parts of tracks of operating record carriers of operating tapes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
    • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/90—Tape-like record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/90—Tape-like record carriers
    • G11B2220/91—Helical scan format, wherein tracks are slightly tilted with respect to tape direction, e.g. VHS, DAT, DVC, AIT or exabyte
    • G11B2220/913—Digital audio tape [DAT] format

Definitions

  • This invention relates to search methods for recording media and to apparatus and methods for recording and/or reproducing digital signals.
  • Data stored on a hard disc or the like of a computer can be transferred to and recorded by a data streamer or data recorder once a day, so as to protect or back up the data.
  • analog audio tape recorders have been used in certain cases.
  • analog tape recorders have disadvantages in that they need a considerable amount of magnetic tape for recording, and they operate at a relatively low data transferring rate upon recording, so that it takes a long time to transfer and record such data information.
  • analog tape recorders have further problems, for example the starting point of a desired portion of the recorded data information cannot be rapidly searched for.
  • a DAT data transferred from a host computer is transformed in accordance with a DAT format before recording.
  • the DAT format one frame is made up of two oblique tracks formed by one rotation of two heads having different azimuth angles.
  • 16-bit pulse code modulation (PCM) audio data which has been interleaved, and auxiliary sub-data are recorded in this one frame area as a unit.
  • PCM pulse code modulation
  • the DAT has a high-speed search function.
  • the high-speed search operation in the previously-proposed DAT is performed by the method shown in Figure 1 of the accompanying drawings.
  • a target position of a magnetic tape 15 on which positions signals "1", “2", “3”, ... are recorded is designated, for example, as "4" in performing a search operation
  • a position detection signal is detected while driving the tape 15 typically at 200-times normal playback speed.
  • a stop signal is supplied, and the tape 15 passes by the target position and is then stopped.
  • the tape 15 then travels in the reverse direction typically at 16-times normal speed, and when the target position is detected, a stop signal is supplied. In this case, the tape 15 passes by the target position in the reverse direction and is again stopped.
  • the tape 15 is again reversed in direction and travels at 3-times the normal speed.
  • the stop signal is supplied.
  • the tape 15 is once again reversed and travels in the reverse direction at the normal speed.
  • the tape 15 slightly passes by the target position, and is then stopped. In this case, a search end signal is generated, and the next command signal is awaited.
  • the command signal is supplied in this waiting state, the magnetic tape 15 travels in the opposite direction at the normal speed, and the target position "4" is accurately detected.
  • European Patent Application Serial No. EP-A-0 173 474 discloses a high-speed search operation similar to that described above, in which the tape drive direction is changed and the speed reduced each time the target position is detected.
  • UK Patent Application Serial No. GB-A-2 013 935 discloses a record carrier provided with addresses in the form of code pulses and sync pulses. Forward or reverse high-speed search is possible by entering the desired address in an address memory, the search operation proceeding in a similar manner to that described above.
  • a search method for use with a recording medium on which a plurality of position signals are recorded at intervals comprising the steps of:
  • apparatus for searching a recording medium on which a plurality of position signals are recorded at intervals, the apparatus comprising: drive means for driving the recording medium; detecting means for detecting the recorded position signals; and control means for controlling the drive means in response to the detecting means, the control means being operable to cause the drive means to:
  • a preferred embodiment of the present invention provides a search method for a recording medium, which is capable of performing a search operation without wasting time.
  • a target count value and a count value reproduced from the recording medium are preferably compared with each other, the direction and speed of the recording medium are controlled in accordance with the comparison output, and when the count value reproduced from the recording medium comes close to the target count value, the report signal is generated after detecting a division of the unit count signal.
  • FIG. 2 shows an arrangement in which a DAT 1 is used as a data recorder, the arrangement also including an interface bus 2, a host computer 3, and inner buses 4, 5.
  • the DAT 1 includes a recording/reproducing section 6, a recording amplifier 7, a reproducing amplifier 8, a signal processing circuit 9, a random access memory (RAM) 10, a data controller 11, an interface board 12, a system controller 13 and a servo and motor drive circuit 14.
  • RAM random access memory
  • the system controller 13, the signal processing circuit 9 and the data controller 11 are arranged to exchange predetermined signals such as an absolute frame number AFNO, a mode instruction, a logical frame number LFNO, a data transfer instruction and the like.
  • the recording/reproducing section 6 is provided with a rotary head drum.
  • a magnetic tape is wound around the drum over an angular range of about 90° and is fed by a capstan.
  • the drum has two heads A and B having different azimuth angles. During one revolution of the drum, two oblique tracks are recorded on or reproduced from the tape.
  • Digital data supplied from the host computer 3 through the buses 5, 2 and 4 is input to the interface board 12, and is then subjected to predetermined signal processing in the data controller 11, the RAM 10, and the signal processing circuit 9 in accordance with instructions from the system controller 13. In this manner, conversion to the DAT format (described above) is performed.
  • the converted signal is supplied to the recording/reproducing section 6 through the recording amplifier 7, and is recorded on the magnetic tape by the heads A and B.
  • the signal recorded on the magnetic tape can also be reproduced by the heads A and B.
  • the reproduced signal is supplied to the signal processing circuit 9 through the reproducing amplifier 8.
  • Digital data which is obtained by reconverting the reproduced signal in the signal processing circuit 9 is supplied to the host computer 3 through the data controller 11, the interface board 12 and the buses 4, 2 and 5.
  • the DAT format which is used on the magnetic tape is as shown in Figure 3.
  • two oblique tracks TA and TB are formed on a tape 15 starting from its lower side, as indicated by an arrow a .
  • the two tracks TA and TB constitute one frame.
  • Each of the tracks TA and TB consists of 196 blocks, and one block consists of 288 bits.
  • 34 blocks at each end portion serve as a sub area, and 128 central blocks serve as a main area.
  • Each sub area is further divided into sections. More specifically, there are provided, from the lower end of the track, a margin section, a phase lock loop (PLL) preamble section of a sub code, a first sub-code section constituted of 8 blocks, a postamble section, a gap section for a block section, a tracking (ATF) signal section, a gap section between adjacent blocks, and a PLL preamble of data. Then, after the main data section there follows a gap section between adjacent blocks, an ATF signal section, a gap section between adjacent blocks, a PLL preamble section of a sub code, a second sub-code section constituted by 8 blocks, a postamble second sub-code section, and a margin section.
  • the other blocks are constituted by respective predetermined numbers of blocks. It should be noted that in Figure 3, the measure of the lengths of the sections is not to scale.
  • the main area consists of 128 data blocks. As shown in Figure 4, each block is constituted by an 8-bit synchronising (sync) signal, an 8-bit pulse code modulation identification (PCM-ID) signal W1, an 8-bit block address W2 and an 8-bit parity, and main data is stored in the following 256-bit section.
  • the main data is 16-bit PCM data for left L and right R channels when an audio signal is processed.
  • the 16-bit main data is interleaved in the main areas of the tracks TA and TB (one frame) together with the parity. In this case, in the main areas in one frame, about 5760 bytes of data are recorded.
  • the DAT is used as a data recorder, the data sent from the host computer 3 is converted into 16-bit data and is processed in the same manner as the PCM data. This data is formatted as shown in Figure 5 and is recorded in the main areas comprising one frame.
  • the above-mentioned 5760 bytes are divided into 1440 words (0 to 1439), each consisting of 4 bytes (32 bits). These words are divided into 16-bit (2-byte) L and R channels to correspond to the audio signal.
  • a header portion is provided in the first word (4 bytes).
  • MSB most significant bit
  • the remaining one byte in this L channel is used as a logical frame number (LFNO) area.
  • LFNO logical frame number
  • Each 8-bit LFNO area provides a binary value indicating one of a series of numbers (1 to 23) of frames.
  • the frames are organised in units or groups of 23 frames.
  • the same data as that in the L channel is provided.
  • a total of 5756 bytes of a data portion is provided in the following words "1" to "1439", and data signals from the host computer 3 are sequentially stored in respective words in units of 4 bytes each.
  • Each LFNO area indicates one of the serial numbers 1 to 23 of the frames in units of 23 frames. That is, the frame numbers 1 to 23 repeatedly appear every 23 frames.
  • Each of the first and second sub-code sections consists of 8 sub-code blocks, and can record 2048 bits of data.
  • Figures 6A and 6B show, respectively, the constructions of the even-numbered sub-code blocks (EVEN blocks) and the odd-numbered sub-code blocks (ODD blocks), in each of which a synchronising signal, the areas W1 and W2 and a parity, respectively formed of eight bits, and 256 bits of sub-code data including a parity, are located in this order.
  • the sub-code data is divided into four packs formed of 64 (8 x 8) bits (eight symbols), respectively.
  • the contents of the areas W1 and W2 in the EVEN block are different from those in the ODD block, and the packs in the EVEN and ODD blocks are alternately numbered from "1" to "7".
  • the eighth pack is assigned to record an error detecting code C1.
  • the area W1 of the EVEN block consists of a 4-bit area ID and a 4-bit data ID, and the area W2 thereof consists of an upper bit "1", a 3-bit pack ID, and a 4-bit block address.
  • the area W1 in the ODD block consists of a 4-bit indefinite portion, and a 4-bit format ID, and the area W2 thereof consists of an upper bit "1", a 3-bit all "0" code, and a 4-bit block address.
  • Each of the packs “1" to “7” is divided into 8 words in units of 8 bits.
  • Each word includes, together with a parity, various codes such as a code indicating a read-in area of a recording start portion on a tape, a code indicating a read-out area of a recording end portion, a code indicating a recording date, an absolute frame number, a logical frame number and the like.
  • Figure 7 shows the format of the pack "1" of the seven packs
  • Figure B shows the format of the pack "2".
  • the pack “1" consists of eight 8-bit words, PC1 to PC8.
  • the upper four bits of the word PC1 are assigned to a pack number (in this case, "0001" indicating pack "1"), and the next 2 bits are indefinite.
  • the following lower two bits (P,M) provide a repeat ID (R-ID) associated with multiple writing of data for a plurality of units.
  • PC2 and PC3 (16 bits) are assigned to a group count GPC.
  • the group count GPC is a value obtained by counting the number of units of 23 frames (called groups hereinafter) from the leading end of a tape.
  • PC4 to PC7 (32 bits) are assigned to a file mark count FMC.
  • a file mark indicates a division of a predetermined amount of data sent from the host computer.
  • the file mark count FMC is a value obtained by counting the number of file marks from the leading end of the tape until counting of the count GPC is completed for the group of 23 frames.
  • the word PC 8 is assigned to a parity for the words PC1 to PC7.
  • the pack "2" consists of 8 words PC1 to PC8.
  • the upper 4 bits of the word PC1 are assigned to a pack number (in this case, "0010" indicating the pack "2").
  • the words PC2 and PC3 (16 bits) are assigned to a save set mark count SSMC.
  • Data recorded by the data recorder during one back-up operation is called a save set, and a save set mark is sent from the host computer for each save set.
  • the save set mark count SSMC indicates a value obtained by counting the number of save set marks from the leading end of the tape until counting of the count GPC is completed for each group of 23 frames.
  • the following words PC4 to PC7 (32 bits) are assigned to a record mark count RMC.
  • a record mark is a mark sent from the host computer for each division of the predetermined amount of data.
  • the record mark count RMC indicates a value obtained by counting the number of record marks from the leading end of the tape until counting of the count GPC is completed for each group of 23 frames.
  • the word PC8 is assigned to a parity for the words PC1 to PC7.
  • the packs “1" and “2" provide four count values GPC, FMC, SSMC, and RMC respectively indicating divisions of data.
  • these count values represent four types of units. These units are not particularly associated with data lengths (recording lengths on a tape), and have predetermined independent lengths.
  • the counts FMC, SSMC, and RMC are represented in association with the count GPC.
  • Figure 9 shows the relationship between the counts GPC and SSMC.
  • the number of save set marks from the leading end of the tape until each time when a group of 23 frames is completed is recorded as the count SSMC in each of the 23 frames constituting the group including the timing.
  • SSMC 7 is recorded in each of the 23 frames of the group of GPC 1.
  • the same set of SSMC 8 extends over two groups of GPC 2 and GPC 3. Therefore, counts SSMC 8 are recorded in each of the 46 frames of these groups.
  • the relationships between the other counts FMC and RMC and the count GPC are also determined in the same manner as in Figure 9.
  • Figure 10A shows examples of the indications of the counts GPC, FMC, SSMC, and RMC for the respective groups.
  • the above-mentioned counts GPC, FMC, SSMC, and RMC can be selectively detected, so that a high-speed search operation can be performed effectively.
  • the high-speed search operation includes a fast forward (FF) search mode as shown in Figure 10B in which the search operation is performed while fast-forwarding the tape typically at 200-times normal playback speed in a normal or forward (FWD) direction.
  • FF fast forward
  • FWD normal or forward
  • a rewind (REW) search mode ensues in which the search operation is performed while rewinding the tape in the reverse (REW) direction typically at 16-times normal speed.
  • a report is returned to the computer that the target position has been detected.
  • the computer instructs the DAT to forward the tape at normal speed.
  • Figure 10C shows the case in which a REW search mode is executed.
  • the rewinding operation is performed until it is detected that the tape has passed by the target position.
  • a stop signal is sent to the tape drive system as well as a signal for driving the tape at 16-times normal speed in the forward direction.
  • the tape has passed by the target position and stopped, and is then reversed to travel at 16-times normal forward speed while detecting the FMC.
  • the 16-times normal speed operation is continued until it is again determined that the tape has passed by the target position.
  • the tape travel direction is reversed and the tape travels at 3-times normal reverse speed until it is determined that the tape has passed by the target position.
  • the host computer is informed by the DAT through the bus line that the target position has been detected. After a 200-msec standby time has passed, the next command signal is awaited. When the next command signal is received, the FMC is detected while feeding the tape at the normal speed to detect the target position "4".
  • Figures 11A and 11B are a flow chart of the steps taken by the system controller when the FF and REW search modes are executed.
  • a reference symbol tp indicates a target position represented by the FMC
  • a symbol pp represents a present position on the tape represented by the FMC.
  • a reference symbol GPC1 denotes a present GPC
  • GPC2 represents an immediately preceding GPC. Therefore, during transport of the tape, the present GPC1 serves as the GPC2 when the next GPC1 is detected.
  • the count FMC is detected while fast-forwarding the tape at 200-times normal speed.
  • the fast-forwarding operation is performed until it is detected in a step (4) that tp ⁇ pp, indicating that the tape has arrived at the target position or has passed by the target position. If the determination is YES in the step (4), a stop signal is sent to the tape drive system in a step (5) as well as a signal for driving the tape at 16-times normal speed in the opposite direction.
  • the tape has passed by the target position and stopped, and is then reversed, so that it travels at 16-times normal speed while detecting the FMC.
  • a step (6) as the tape is travelling, the GPCs are detected and sequentially set to be GPC1 and GPC2.
  • a step (9) the host computer is informed by the sending of a "Good Report" signal through the bus line that the target position has been detected.
  • the next command signal is awaited in a step (11).
  • an operation is performed in accordance with the command signal in a step (12).
  • the FMC is detected while forwarding the tape at normal speed to search the target position "4". If no command signal is supplied in the step (11), the tape is stopped in a step (13), and the routine is ended in a step (14).
  • step (15) to forward the tape, and the GPC is detected in a step (16).
  • the step (16) is repeated until tp ⁇ pp in a step (17), namely until the tape has passed by the target position again.
  • step (20) the tape direction is reversed, and after 600 msec have passed, the flow advances to a step (11). If GPC1 - GPC2 ⁇ 1 is established in the step (18), an error report is provided in a step (21), the tape is stopped in a step (22), and the routine is ended in a step (23).
  • the REW search mode is executed ( Figure 11B).
  • the count FMC is detected while rewinding the tape at 200-times normal speed.
  • the rewinding operation is performed until tp > pp is established in a step (25) to determine that the tape has passed by the target position. If the determination is YES in the step (25), a stop signal is sent to the tape drive system in a step (26) as well as a signal for driving the tape at 16-times normal speed in the opposite direction.
  • the tape has passed by the target position and stopped, and is then reversed to travel at 16-times normal speed while detecting the FMC.
  • the host computer is informed by the sending of a "Good Report" signal through the bus line that the target position has been detected.
  • the counts GPC and FMC are used as position signals of the recording medium.
  • the search operation can alternatively be performed using the above-mentioned counts SSMC and RMC, as a matter of course.
  • This search method requires two time periods, namely a long period of time until the search end and also a time period waiting for the next operation command. In other words, there are required a time during which the tape is stopped, and also a rising-up time when the tape is stopped and then accelerated to its predetermined speed.

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)

Claims (5)

  1. Procédé de recherche destiné à être utilisé avec un support d'enregistrement (15) sur lequel une pluralité de signaux de position (GPC) sont enregistrés selon certains intervalles, le procédé comprenant les étapes de :
    a) entraînement du support d'enregistrement (15) initialement selon un certain sens tout en détectant les signaux de position enregistrés (GPC) par rapport à une position qui est fixe par rapport au support d'enregistrement (15) ;
    b) inversion du sens d'entraînement du support d'enregistrement (15) après qu'un signal de position enregistré prédéterminé a été détecté ;
    c) diminution de la vitesse du support d'enregistrement (15) et entraînement du support d'enregistrement (15) à la vitesse diminuée jusqu'à ce que le signal de position enregistré prédéterminé soit détecté à nouveau ;
    d) répétition des étapes précédentes b) et c) un nombre prédéterminé de fois de manière à détecter une position cible sur le support d'enregistrement (15) ; et
       après détection du fait que la position cible a été passée pendant l'étape finale du nombre prédéterminé d'étapes précédentes, génération d'un signal de rapport indiquant que la position cible a été trouvée,
       caractérisé en ce que le signal de rapport est généré tandis que le support d'enregistrement (15) se déplace encore pendant l'étape de détection finale de telle sorte que le support d'enregistrement (15) soit arrêté si aucun signal de commande n'est reçu pendant une durée prédéterminée après que le signal de rapport a été généré.
  2. Procédé de recherche selon la revendication 1, dans lequel des données sont enregistrées dans une pluralité d'unités sur le support d'enregistrement (15) et dans lequel des données principales sont enregistrées dans une première zone, dans chaque unité située sur le support d'enregistrement et un signal de comptage d'unités ainsi que d'autres signaux de comptage sont enregistrés dans une seconde zone, dans chaque unité.
  3. Procédé de recherche selon la revendication 2, dans lequel un enregistreur à bande audionumérique (1) est utilisé pour effectuer la recherche, la première zone est une zone de modulation par impulsions et codage et la seconde zone est une zone de sous-code.
  4. Procédé de recherche selon la revendication 1, 2 ou 3, dans lequel une valeur de comptage cible et une valeur de comptage d'unités reproduite à partir du support d'enregistrement (15) sont comparées l'une à l'autre, le sens et la vitesse du support d'enregistrement sont commandés en relation avec la sortie de comparaison et lorsque la valeur de comptage reproduite à partir du support d'enregistrement devient proche de la valeur de comptage cible, le signal de rapport est généré après détection d'une division du signal de comptage d'unités.
  5. Appareil pour effectuer une recherche sur un support d'enregistrement (15) sur lequel une pluralité de signaux de position (GPC) sont enregistrés selon certains intervalles, l'appareil comprenant :
       un moyen d'entraînement (14) pour entraîner le support d'enregistrement (15) ;
       un moyen de détection pour détecter les signaux de position enregistrés (GPC) ; et
       un moyen de commande (13) pour commander le moyen d'entraînement (14) en réponse au moyen de détection, le moyen de commande (13) pouvant être actionné pour forcer le moyen d'entraînement à :
    a) entraîner initialement le support d'enregistrement (15) selon un certain sens tout en détectant les signaux de position enregistrés (GPC) par rapport à une position qui est fixe par rapport au support d'enregistrement (15) ;
    b) inverser le sens d'entraînement du support d'enregistrement (15) après qu'un signal de position enregistré prédéterminé a été détecté ;
    c) diminuer la vitesse du support d'enregistrement (15) et entraîner le support d'enregistrement (15) à la vitesse diminuée jusqu'à ce que le signal de position enregistré prédéterminé soit détecté à nouveau ;
    d) répéter les étapes précédentes b) et c) un nombre prédéterminé de fois de manière à détecter une position cible sur le support d'enregistrement (15) ; et
       après détection du fait que la position cible a été passée pendant l'étape finale du nombre prédéterminé d'étapes précédentes, générer un signal de rapport indiquant que la position cible a été trouvée,
       caractérisé en ce que le signal de rapport est généré tandis que le support d'enregistrement (15) se déplace encore pendant l'étape de détection finale de telle sorte que le support d'enregistrement (15) soit arrêté si aucun signal de commande n'est reçu pendant une durée prédéterminé après que le signal de rapport a été généré.
EP89300103A 1988-01-08 1989-01-06 Méthodes de recherche pour milieux d'enregistrement Expired - Lifetime EP0323910B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8800352 1988-01-08
GB888800352A GB8800352D0 (en) 1988-01-08 1988-01-08 Search method for recording medium

Publications (3)

Publication Number Publication Date
EP0323910A2 EP0323910A2 (fr) 1989-07-12
EP0323910A3 EP0323910A3 (en) 1990-10-24
EP0323910B1 true EP0323910B1 (fr) 1993-10-20

Family

ID=10629649

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Application Number Title Priority Date Filing Date
EP89300103A Expired - Lifetime EP0323910B1 (fr) 1988-01-08 1989-01-06 Méthodes de recherche pour milieux d'enregistrement

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Country Link
US (1) US4958244A (fr)
EP (1) EP0323910B1 (fr)
JP (1) JP2740217B2 (fr)
KR (1) KR0155356B1 (fr)
DE (1) DE68909956T2 (fr)
GB (1) GB8800352D0 (fr)

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JP2751363B2 (ja) * 1989-04-13 1998-05-18 ソニー株式会社 ビデオディスクプレーヤ
KR920004249B1 (ko) * 1989-06-10 1992-05-30 삼성전자 주식회사 디지탈 오디오 테이프 레코더의 고속 서치방법
EP0429727B1 (fr) * 1989-11-30 1996-01-17 Sony Corporation Enregistreur de données
JPH03183050A (ja) * 1989-12-12 1991-08-09 Matsushita Electric Ind Co Ltd データ記録方法とエンドサーチ方法とつなぎ記録方法
JPH0770203B2 (ja) * 1990-01-06 1995-07-31 日本ビクター株式会社 デジタルデータ再生装置
EP0448011B1 (fr) * 1990-03-19 1997-11-12 Canon Kabushiki Kaisha Appareil de reproduction d'images fixes
KR910017365A (ko) * 1990-03-27 1991-11-05 이우에 사또시 디지탈 오디오 테이프 레코더
DE69129320T2 (de) * 1990-10-23 1998-08-20 Tandberg Data Asa, Oslo Verfahren und Gerät zum schnellen Zugriff auf einem logischen Block auf einem Bandmedium
US5194995A (en) * 1991-01-09 1993-03-16 Wangdat, Inc. Method and apparatus for recording compressed data on DAT media
JP2769250B2 (ja) * 1991-06-19 1998-06-25 三菱電機株式会社 磁気テープ再生装置
ATE179274T1 (de) * 1992-02-28 1999-05-15 E Systems Inc Systembereiche für bandladeoperationen
US5446603A (en) * 1993-12-21 1995-08-29 Dictaphone Corporation Method of retrieving messages at selected times from a digital audio tape
JPH08221844A (ja) * 1995-02-20 1996-08-30 Sony Corp データレコーダ
US6792542B1 (en) * 1998-05-12 2004-09-14 Verance Corporation Digital system for embedding a pseudo-randomly modulated auxiliary data sequence in digital samples
JP3074810U (ja) * 2000-07-12 2001-01-26 船井電機株式会社 ビデオデッキ
US6785076B1 (en) * 2000-07-17 2004-08-31 Hewlett-Packard Development Company, L.P. Alternate tape repositioning method during data recovery

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JPH0115002Y2 (fr) * 1980-09-06 1989-05-02
US4774699A (en) * 1981-12-21 1988-09-27 Discovision Associates Method and apparatus for positioning a read head to a selected track on a record disc
JPS59119580A (ja) * 1982-12-27 1984-07-10 Toshiba Corp デイスクレコ−ド再生装置
JP2510410B2 (ja) * 1983-10-27 1996-06-26 パイオニア株式会社 デイスクプレ−ヤの情報選択装置
DE3583905D1 (de) * 1984-08-31 1991-10-02 Ampex Verfahren und vorrichtung zur steuerung der lage eines transportierten bandes.
JPH0531739Y2 (fr) * 1985-11-21 1993-08-16
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Also Published As

Publication number Publication date
KR890012302A (ko) 1989-08-25
JPH01204251A (ja) 1989-08-16
EP0323910A3 (en) 1990-10-24
DE68909956T2 (de) 1994-04-28
DE68909956D1 (de) 1993-11-25
GB8800352D0 (en) 1988-02-10
KR0155356B1 (ko) 1998-12-15
US4958244A (en) 1990-09-18
JP2740217B2 (ja) 1998-04-15
EP0323910A2 (fr) 1989-07-12

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